In men, smoking can cause impotence because it limits the blood supply to the penis. It can also reduce the fertility of both men and women.

Health risks of passive smoking

Secondhand smoke comes from the tip of a lit cigarette and the smoke that the smoker breathes out.

Breathing in secondhand smoke – also known as passive smoking – increases your risk of getting the same health conditions as smokers. For example, breathing in secondhand smoke increases a non-smoker's risk of developing lung cancer by about a quarter.

Babies and children are particularly vulnerable to the effects of secondhand smoke. A child who is exposed to passive smoke is at increased risk of developing chest infections, meningitis, a persistent cough and, if they have asthma, their symptoms will get worse. They're also at increased risk of cot death and an ear infection called glue ear.